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How to check whether the IP Address of the user is passively added to the Blacklist of the Firewall?

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In CLI mode, run the display firewall blacklist item command to view the blacklist of the firewall, and check whether the IP address of the user is on the blacklist. If the IP address of the user is on the blacklist, the firewall directly discards all packets of this user. If the corresponding blacklist entry exists, run the undo firewall blacklist item command to delete the blacklist entry.

They can overlap with each other.
If an IP address to be added overlaps with an IP address of another user-defined or predefined region, the adding operation succeeds, and the overlapping IP address is automatically removed from this another predefined or user-defined region.

On Huawei S series switches (except the S1700), run the lldp management-address command to configure the LLDP management IP address. Check whether the IP address on neighbor devices is the same as that configured using this command.